Piercing Howl causes Physical Damage to a single opponent, and also knocks them down. The Howl of Despair morph adds the ​Feeding Frenzy Synergy, which increases your allies' attack damage. Or you can choose Howl of Agony, which causes additional damage to targets afflicted by the Fear status. This morph works best with Roar, as that will cause fear in your opponents. Otherwise, it is mostly only useful immediately after a Werewolf Transformation, unless your allies also have Fear abilities.